Question

find the value of x.
a. 45
b. 56
c. 30
d. 15

Explanation:

Step1: Set up the equation

The sum of angles on a straight line is \(180^{\circ}\). So, \(4x + 60=180\).

Step2: Solve for \(x\)

Subtract \(60\) from both sides: \(4x=180 - 60\), which gives \(4x = 120\). Then divide both sides by \(4\): \(x=\frac{120}{4}\).

Answer:

\(x = 30\), so the answer is C. 30.